This Is a Certified Answer

Certified answers contain reliable, trustworthy information vouched for by a hand-picked team of experts. Brainly has millions of high quality answers, all of them carefully moderated by our most trusted community members, but certified answers are the finest of the finest.
Junk food are fast food which can be cooked easily and can be eaten easily but it is also harmful for our body and brain 

brain is made up of nervers cells and nevers fiber and it has three part 

                                                        JUNK   FOOD
The word 'junk' means something which is similar to garbage or considered as garbage and it is of no use and very less in value. So we understand that junk food is a food which is of no use, causes diseases, is of very less value, kills people. A junk is very very bad for our health, it causes many diseases to us, harms us, sometimes even kill us. It is very very low in nutrients but high in calories and fats. Every junk food harms us. Therefore, we should never consume junk foods and consume only good foods that are good for health!! Some examples of junk foods are burger, pizza, chowmin, chips, soft drinks, etc!!
    Brain is a very delicate organ of our body which is inside our head. It is a organ which controls the whole functioning of our body. It is connected with all the nerves of our body. If something is sensed by by our body the nerves carry signals to the brain and the brain responds to the signals and we understand what we have to do!!
I hope this answer might be helpful!!